Cardiovascular system - cardiac conduction system

Question 1

SA node

Answer 1

Located upper wall of the right atrium, it spontaneously generates electrical impulses to trigger atrial contraction

Question 2

AV node

Answer 2

The electrical signals then pass through the AV node, which conducts electrical impulses from the top to bottom chambers of the heart, controlling HR.

Question 3

Bundle of HIS

Answer 3

From AV node, electrical signals then travel along the bundle of HIS, which carry the signals from the AV node to the bundle branches.

Question 4

Purkinje Fibres

Answer 4

Finally, the electrical signals spread rapidly through to the Purkinje fibres, which receive the signals to cause ventricular contraction.